linux-kernel - Re: [PATCH v2] perf tools: Remove cast of non-variadic function to variadic

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Message-ID: <20131101133626.GA6409@infradead.org>
Date:	Fri, 1 Nov 2013 11:36:26 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Michael Hudson-Doyle <michael.hudson@...aro.org>
Cc:	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Jean Pihet <jean.pihet@...aro.org>
Subject: Re: [PATCH v2] perf tools: Remove cast of non-variadic function to
 variadic

Em Thu, Oct 31, 2013 at 04:47:45PM -0700, Michael Hudson-Doyle escreveu:
> -int percent_color_snprintf(char *bf, size_t size, const char *fmt, double percent)
> +int percent_color_snprintf(char *bf, size_t size, const char *fmt, ...)
>  {
> -	const char *color = get_percent_color(percent);
> +	va_list args;
> +	double percent;
> +	const char *color;
> +
> +	va_start(args, fmt);
> +	percent = va_arg(args, double);
> +	va_end(args);
> +	color = get_percent_color(percent);
>  	return color_snprintf(bf, size, color, fmt, percent);
>  }

As a bug fix I'm merging this now, but I wonder if, since we're doing
the va_start/end dance here, can't we call some color_vsnprintf variant
so as to avoid doing it twice?

I'll look into that after going thru more urgent stuff.

- Arnaldo
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